--- darcs-2.14.2/Setup.hs	2019-01-27 03:14:51.000000000 +1300
+++ darcs.net/Setup.hs	2019-10-18 02:41:57.000000000 +1300
@@ -11,7 +11,9 @@
          , TestSuite(testBuildInfo)
          , updatePackageDescription
          , cppOptions, ccOptions
-         , library, libBuildInfo, otherModules )
+         , library, libBuildInfo, otherModules
+         , ComponentName(CExeName)
+         )
 import Distribution.Package
          ( packageVersion )
 import Distribution.Version( Version )
@@ -21,24 +23,27 @@
 import Distribution.Simple.Setup
     (buildVerbosity, copyDest, copyVerbosity, fromFlag,
      haddockVerbosity, installVerbosity, sDistVerbosity, replVerbosity )
-import Distribution.Simple.BuildPaths ( autogenModulesDir )
+import Distribution.Simple.BuildPaths ( autogenPackageModulesDir )
 import Distribution.System
          ( OS(Windows), buildOS )
 import Distribution.Simple.Utils
     (copyFiles, createDirectoryIfMissingVerbose, rawSystemStdout,
-     rewriteFile )
+     rewriteFileEx)
+import Distribution.Types.UnqualComponentName
 import Distribution.Verbosity
-         ( Verbosity )
+         ( Verbosity, silent )
 import Distribution.Text
          ( display )
-import Control.Monad ( unless, void )
 
+import Control.Monad ( unless, when, void )
 import System.Directory
     ( doesDirectoryExist, doesFileExist )
 import System.IO
     ( openFile, IOMode(..) )
 import System.Process (runProcess)
 import Data.List( isInfixOf, lines )
+import qualified Data.Map as M
+import Data.Maybe ( isJust )
 import System.FilePath       ( (</>) )
 import Foreign.Marshal.Utils ( with )
 import Foreign.Storable      ( peek )
@@ -75,8 +80,8 @@
         verb = fromFlag $ sDistVerbosity flags
     x <- versionPatches verb pkgVer
     y <- context verb
-    rewriteFile "release/distributed-version" $ show x
-    rewriteFile "release/distributed-context" $ show y
+    rewriteFileEx silent "release/distributed-version" $ show x
+    rewriteFileEx silent "release/distributed-context" $ show y
     putStrLn "about to hand over"
     let pkg' = pkg { library = sanity (library pkg) }
         sanity (Just lib) = Just $ lib { libBuildInfo = sanity' $ libBuildInfo lib }
@@ -105,8 +110,7 @@
   littleEndian <- testEndianness
   let args = ("-DPACKAGE_VERSION=" ++ show' version) :
              [arg | (arg, True) <-         -- include fst iff snd.
-              [-- We have MAPI iff building on/for Windows.
-               ("-DHAVE_MAPI", buildOS == Windows),
+              [
                ("-DLITTLEENDIAN", littleEndian),
                ("-DBIGENDIAN", not littleEndian)]]
       bi = emptyBuildInfo { cppOptions = args, ccOptions = args }
@@ -133,20 +137,26 @@
 -- man page
 -- ---------------------------------------------------------------------
 
+hasDarcsExe :: LocalBuildInfo -> Bool
+hasDarcsExe = isJust . M.lookup darcsExe . componentNameMap where
+  darcsExe = CExeName (mkUnqualComponentName "darcs")
+
 buildManpage :: LocalBuildInfo -> IO ()
-buildManpage lbi = do
-  let darcs = buildDir lbi </> "darcs/darcs"
-      manpage = buildDir lbi </> "darcs/darcs.1"
-  manpageHandle <- openFile manpage WriteMode
-  void $ runProcess darcs ["help","manpage"]
-             Nothing Nothing Nothing (Just manpageHandle) Nothing
+buildManpage lbi =
+  when (hasDarcsExe lbi) $ do
+    let darcs = buildDir lbi </> "darcs/darcs"
+        manpage = buildDir lbi </> "darcs/darcs.1"
+    manpageHandle <- openFile manpage WriteMode
+    void $ runProcess darcs ["help","manpage"]
+            Nothing Nothing Nothing (Just manpageHandle) Nothing
 
-installManpage :: PackageDescription -> LocalBuildInfo
-                  -> Verbosity -> CopyDest -> IO ()
+installManpage :: PackageDescription -> LocalBuildInfo -> Verbosity -> CopyDest -> IO ()
 installManpage pkg lbi verbosity copy =
-    copyFiles verbosity
-              (mandir (absoluteInstallDirs pkg lbi copy) </> "man1")
-              [(buildDir lbi </> "darcs", "darcs.1")]
+  when (hasDarcsExe lbi) $
+    copyFiles
+      verbosity
+      (mandir (absoluteInstallDirs pkg lbi copy) </> "man1")
+      [(buildDir lbi </> "darcs", "darcs.1")]
 
 -- ---------------------------------------------------------------------
 -- version module
@@ -187,12 +197,13 @@
 generateVersionModule :: Verbosity -> LocalBuildInfo
                       -> String -> String -> IO ()
 generateVersionModule verbosity lbi version state = do
-  let dir = autogenModulesDir lbi
+  let dir = autogenPackageModulesDir lbi
   createDirectoryIfMissingVerbose verbosity True dir
   ctx <- context verbosity
   hash <- weakhash verbosity
-  rewriteFile (dir </> "Version.hs") $ unlines
+  rewriteFileEx silent (dir </> "Version.hs") $ unlines
     ["module Version where"
+    ,"import Darcs.Prelude"
     ,"version, weakhash, context :: String"
     ,"version = \"" ++ version ++ " (" ++ state ++ ")\""
     ,"weakhash = " ++ case hash of